C/2016 N4 Master
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Comet C/2016 N4 was discovered on 15 July 2016 with Mobile Astronomical System of the Telescope-Robots (MASTER), that is about  months after its perihelion passage.

Some prediscovery images of this comet were found: taken on 11 September 2015 by ISON-SSO Observatory (Siding Spring).

Solutions given here are based on data spanning over 4.54 yr in a range of heliocentric distances: 7.14 au – 3.199 au (perihelion) – 8.37 au.

NG orbits using full data-arc as well as independently using pre-perihelion and post-perihelion data are determinable.

See also Królikowska and Dones 2023.
solution description
number of observations 2075
data interval 2015 09 11 – 2020 03 26
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.14 au – 3.20 au (perihelion) – 8.37 au
type of model of motion NH - non-gravitational orbits for water sublimation from subsolar point
data weighting YES
number of residuals 4096
RMS [arcseconds] 0.43
orbit quality class 1a+
previous orbit statistics, both Galactic and stellar perturbations were taken into account
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
previous reciprocal semi-major axis [10-6 au-1] 177.84 – 178.75 – 179.62
previous perihelion distance [au] 3.18829 – 3.18843 – 3.18856
previous aphelion distance [103 au] 11.13 – 11.19 – 11.24
time interval to previous perihelion [Myr] 0.4149 – 0.4179 – 0.4211
percentage of VCs with qprev < 10100
Upper panel: Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
previous orbit statistics, here only the Galactic tide has been included
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
previous reciprocal semi-major axis [10-6 au-1] 177.83 – 178.75 – 179.62
previous perihelion distance [au] 3.19143 – 3.19159 – 3.19174
previous aphelion distance [103 au] 11.13 – 11.19 – 11.24
time interval to previous perihelion [Myr] 0.4148 – 0.4179 – 0.4211
percentage of VCs with qprev < 10100